DISCLAIMER! the below MAY only apply if you have, prior to the shut down, bought a booster - HOWEVER, I have confirmed that on at least one account that never bought a booster, these free packs were delivered.

So every one gets 3 (locked) booster choose your pack booster packs. Just like your 5 free ones a month. You also get one locked choose a loot card for Legacies.

HOWEVER - there seems to be scattered reports on either no delivery - or delayed delivery - I would log on to LON to get the gifts in your collection - but would recommend not claiming them for the time being.

EDIT: I suffered about a 5 minute delay in delivery but then the boosters I claimed showed up.